Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 9, Problem 7RQ
Why are ion channels necessary to transport ions into or out of a cell?
- Ions are too large to diffuse through the membrane.
- Ions are charged particles and cannot diffuse through the hydrophobic interior of the membrane.
- Ions do not need ion channels to move through the membrane.
- Ions bind to carrier proteins in the bloodstream, which must be removed before transport into the cell.
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Why are ion channels necessary to transport ions into or out of a cell? a. Ions are too large to diffuse through the membrane. b. Ions are charged particles and cannot diffuse through the hydrophobic interior of the membrane. c. Ions do not need ion channels to move through the membrane. d. Ions bind to carrier proteins in the bloodstream, which must be removed before transport into the cell.
Which of the following regarding the sodium potassium pump is FALSE?
It tends to be found on the apical plasma membrane of polarized cells
It transports three sodium ions to the outside of the cell
It transports two potassium ions to the inside of the cell.
It helps to maintain unequal distribution of ions across the plasma membrane
Which of the following molecules would be able to passively diffuse into or out of the cell?
Glucose, a sugar
Insulin, a protein
Oxygen gas
Sodium ion
Chapter 9 Solutions
Biology 2e
Ch. 9 - Figure 9.8 HER2 is a receptor tyrosine kinase. In...Ch. 9 - Figure 9.10 In certain cancers, the GTPase...Ch. 9 - Figure 9.17 Which of the following statements...Ch. 9 - Figure 9.18 What advantage might biofilm...Ch. 9 - What property prevents the ligands of cell-surface...Ch. 9 - The secretion of hormones by the pituitary gland...Ch. 9 - Why are ion channels necessary to transport ions...Ch. 9 - Endocrine signals are transmitted more slowly than...Ch. 9 - A scientist notices that when she adds a small,...Ch. 9 - Where do DAG and IP3 originate? They are formed by...
Ch. 9 - What property enables the residues of the amino...Ch. 9 - Histamine binds to the H1 G-protein-linked...Ch. 9 - A scientist observes a mutation in the...Ch. 9 - What is the function of a phosphatase? A...Ch. 9 - How does NF-kB induce gene expression? A small,...Ch. 9 - Apoptosis can occur in a cell when the cell is...Ch. 9 - What is the effect of an inhibitor binding an...Ch. 9 - How does PKC’s signaling role change in response...Ch. 9 - A scientist notices that a cancer cell line fails...Ch. 9 - Which type of molecule acts as a signaling...Ch. 9 - Quorum sensing is triggered to begin when...Ch. 9 - A doctor is researching new ways to treat biofilms...Ch. 9 - What is the difference between intracellular...Ch. 9 - How are the effects of paracrine signaling limited...Ch. 9 - What are the differences between internal...Ch. 9 - Cells grown in the laboratory are mixed with a dye...Ch. 9 - Insulin is a hormone that regulates blood sugar by...Ch. 9 - The same second messengers are used in many...Ch. 9 - What would happen if the intracellular domain of a...Ch. 9 - If a cell developed a mutation in its MAP2K1 gene...Ch. 9 - What is a possible result of a mutation in a...Ch. 9 - How does the extracellular matrix control the...Ch. 9 - A scientist notices that a cancer cell line shows...Ch. 9 - What characteristics make yeasts a good model for...Ch. 9 - Why is signaling in multicellular organisms more...Ch. 9 - Pseudomonas infections are very common in hospital...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
The plasma membrane __________. a. surrounds the cytoplasm b. separates the nucleus from the cytoplasm c. separates the cell interior from the environment d. both a and c
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Most of a membranes diverse functions are carried out by ________ . a. proteins c. nucleic acids b. phospholipids d. hormones
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Which of the following can diffuse most easily through the cell membrane?
N2
Ca++
glucose
The hormone glucagon (a protein)
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if a cell has a net positive charge inside and there is a net negative charge outside the cell, which of the following is correct (if the membrane is permeable to each substance and the concentration of each is the same inside and outside the cell)?
a. negative ions will move into the cell
b. positive ions will move into the cell
c. neutral ions will move into the cell
d. negative ions will move our of the cell
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Which of the following statements best describes the movement of molecules in a cell if its concentration on both sides is the same?
Group of answer choices
The molecules will stop moving across the membrane.
The molecules will continue to move across the membrane in both directions.
The molecules will move across the membrane to the outside of the cell.
The molecules will move across the membrane to the inside of the cell.
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The reason ions such as Na+, K+, and Ca2+ diffuse across plasma membranes more rapidly than would be expected across a lipid membrane is that
their negative charge causes them to dissolve in the polar lipids in the membrane
ions diffuse through polar lipids more readily than non-charged particles do
their positive charge causes them to dissolve in the polar lipids in the membrane
there are proteins that form channels through which these ions can more readily pass
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Which of the following statements about a typical plasma membrane is correct?
The hydrophilic interior of the membrane is composed primarily of the fatty acid tails of the phospholipids.
Carbohydrates on the membrane surface are important in determing the overall bilayer structure.
Phospholipids are the primary component that determines which solute can cross the plasma membrane.
The two sides of the plasma membrane have different lipid and protein composition.
The plasma membrane is covalently linked network of phospholipids and proteins that controls the movement of solutes into and out of a cell.
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The movement of molecules that expends energy to move potassium ions into the cell and a different number of sodium ions out of the cell
Simple Diffusion
Facilitated Diffusion
Osmosis
Sodium-Potassium Pump
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Which of the following is true about the movement of ions across excitable living membranes?
Ions can move passively across membranes through leakage channels
Some ions are prevented from moving down their concentration gradient by ATP-driven pumps.
Ion gates in the membrane can open in response to electrical potential changes.
All of these are correct.
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Which of the following cell membrane proteins allows movement of molecules?
Group of answer choices
channel proteins
receptor protein
structural proteins
glycoprotein
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Microvilli are commonly seen in cells involved in absorption of materials (like intestinal cells) because:
none of the above
they move cells forward
they produce greater surface area of plasma membrane
they move substances forward
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Which of the following is true regarding the smooth endoplasmic reticulum (SER)?
Group of answer choices
It stores the second messenger, cAMP
It is like the RER, it just has half the number of ribosomes associated with the cytosolic side of the membrane (it is less "rough")
It is most prominent in cells that are actively secreting proteins
It contains enzymes that detoxify organic compounds; it is prominent in liver cell
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